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Financial Instruments (Tables)
 6 Months Ended
Jul. 31, 2024
Fair Value Disclosures [Abstract]  
Cash, Cash Equivalents and Investments The following table summarizes the Company’s cash and available-for-sale marketable securities’ amortized cost, gross unrealized gains, gross unrealized losses, and estimated fair value by significant investment category reported as cash and cash equivalents or short-term investments (in thousands):
Reported as
July 31, 2024Amortized CostGross Unrealized GainsGross
Unrealized
Losses		Estimated Fair ValueCash and Cash EquivalentsShort-Term Investments
Cash:$64,905 $— $— $64,905 $64,905 $— 
Level 1:
Money market funds29,648 — — 29,648 29,648 — 
U.S. Treasuries238,437 265 (14)238,688 — 238,688 
Subtotal268,085 265 (14)268,336 29,648 238,688 
Level 2:
Commercial paper178,964 6 (25)178,945 47,796 131,149 
Corporate bonds75,981 80 (7)76,054 — 76,054 
U.S. government agencies$13,101 $— $— $13,101 $— $13,101 
Subtotal$268,046 $86 $(32)$268,100 $47,796 $220,304 
Total$601,036 $351 $(46)$601,341 $142,349 $458,992 
Reported as
January 31, 2024Amortized CostGross Unrealized GainsGross
Unrealized
Losses		Estimated Fair ValueCash and Cash EquivalentsShort-Term Investments
Cash:$72,420 $— $— $72,420 $72,420 $— 
Level 1:
Money market funds47,696 — — 47,696 47,696 — 
U.S. Treasuries86,429 70 (13)86,486 — 86,486 
Subtotal134,125 70 (13)134,182 47,696 86,486 
Level 2:
Commercial paper33,019 3 (3)33,019 9,915 23,104 
Corporate bonds17,883 30 (3)17,910 — 17,910 
U.S. government agencies$21,703 $27 $(10)$21,720 $— $21,720 
Subtotal$72,605 $60 $(16)$72,649 $9,915 $62,734 
Total$279,150 $130 $(29)$279,251 $130,031 $149,220 
Investments Classified by Contractual Maturity Date
The following table summarizes the estimated fair value of the Company’s investments by their remaining contractual maturity dates (in thousands):
July 31, 2024
Due within one year$411,506 
Due between one to two years47,486 
Total$458,992